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/* alloc.c
*
* Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
/*
* Parts of the memalign code were stolen from malloc-930716.
*/
#include <features.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/mman.h>
/* Experimentally off - libc_hidden_proto(memcpy) */
/*libc_hidden_proto(memset)*/
libc_hidden_proto(mmap)
libc_hidden_proto(munmap)
#ifdef L_malloc
void *malloc(size_t size)
{
void *result;
if (unlikely(size == 0)) {
#if defined(__MALLOC_GLIBC_COMPAT__)
size++;
#else
/* Some programs will call malloc (0). Lets be strict and return NULL */
__set_errno(ENOMEM);
return NULL;
#endif
}
#ifdef __ARCH_USE_MMU__
# define MMAP_FLAGS MAP_PRIVATE | MAP_ANONYMOUS
#else
# define MMAP_FLAGS MAP_SHARED | MAP_ANONYMOUS
#endif
result = mmap((void *) 0, size + sizeof(size_t), PROT_READ | PROT_WRITE,
MMAP_FLAGS, 0, 0);
if (result == MAP_FAILED)
return 0;
* (size_t *) result = size;
return(result + sizeof(size_t));
}
#endif
#ifdef L_calloc
void * calloc(size_t nmemb, size_t lsize)
{
void *result;
size_t size=lsize * nmemb;
/* guard vs integer overflow, but allow nmemb
* to fall through and call malloc(0) */
if (nmemb && lsize != (size / nmemb)) {
__set_errno(ENOMEM);
return NULL;
}
result=malloc(size);
#if 0
/* Standard unix mmap using /dev/zero clears memory so calloc
* doesn't need to actually zero anything....
*/
if (result != NULL) {
memset(result, 0, size);
}
#endif
return result;
}
#endif
#ifdef L_realloc
void *realloc(void *ptr, size_t size)
{
void *newptr = NULL;
if (!ptr)
return malloc(size);
if (!size) {
free(ptr);
return malloc(0);
}
newptr = malloc(size);
if (newptr) {
size_t old_size = *((size_t *) (ptr - sizeof(size_t)));
memcpy(newptr, ptr, (old_size < size ? old_size : size));
free(ptr);
}
return newptr;
}
#endif
#ifdef L_free
extern int weak_function __libc_free_aligned(void *ptr);
void free(void *ptr)
{
if (unlikely(ptr == NULL))
return;
if (unlikely(__libc_free_aligned != NULL)) {
if (__libc_free_aligned(ptr))
return;
}
ptr -= sizeof(size_t);
munmap(ptr, * (size_t *) ptr + sizeof(size_t));
}
#endif
#ifdef L_memalign
#include <bits/uClibc_mutex.h>
__UCLIBC_MUTEX_STATIC(__malloc_lock, PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP);
#define __MALLOC_LOCK __UCLIBC_MUTEX_LOCK(__malloc_lock)
#define __MALLOC_UNLOCK __UCLIBC_MUTEX_UNLOCK(__malloc_lock)
/* List of blocks allocated with memalign or valloc */
struct alignlist
{
struct alignlist *next;
__ptr_t aligned; /* The address that memaligned returned. */
__ptr_t exact; /* The address that malloc returned. */
};
struct alignlist *_aligned_blocks;
/* Return memory to the heap. */
int __libc_free_aligned(void *ptr)
{
struct alignlist *l;
if (ptr == NULL)
return 0;
__MALLOC_LOCK;
for (l = _aligned_blocks; l != NULL; l = l->next) {
if (l->aligned == ptr) {
/* Mark the block as free */
l->aligned = NULL;
ptr = l->exact;
ptr -= sizeof(size_t);
munmap(ptr, * (size_t *) ptr + sizeof(size_t));
return 1;
}
}
__MALLOC_UNLOCK;
return 0;
}
void * memalign (size_t alignment, size_t size)
{
void * result;
unsigned long int adj;
result = malloc (size + alignment - 1);
if (result == NULL)
return NULL;
adj = (unsigned long int) ((unsigned long int) ((char *) result - (char *) NULL)) % alignment;
if (adj != 0) {
struct alignlist *l;
__MALLOC_LOCK;
for (l = _aligned_blocks; l != NULL; l = l->next)
if (l->aligned == NULL)
/* This slot is free. Use it. */
break;
if (l == NULL) {
l = (struct alignlist *) malloc (sizeof (struct alignlist));
if (l == NULL) {
free(result);
result = NULL;
goto DONE;
}
l->next = _aligned_blocks;
_aligned_blocks = l;
}
l->exact = result;
result = l->aligned = (char *) result + alignment - adj;
DONE:
__MALLOC_UNLOCK;
}
return result;
}
#endif
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